Merge branch 'author' into staging

Conflicts:
	what_it_is/README.md
#2173
How it works - chapter - SMe review comments CL #97 to #102
#2174
How it works / Security - Self encryption - topic - SME review comments actioned - CL #103 to #108
#2175
How it works / Resilience - Autonomous network - topic - SME updates - CL #108 to #111
#2175
How it works / Resilience - Autonomous network - topic - SME updates - CL #112
#2175
How it works / Resilience - Autonomous network - topic - SME updates - CL #113 and #114
#2175
How it works / Resilience - Autonomous network - topic - renamed topic and in TOC - added new image to topic
#2175
How it works / Resilience - Autonomous network - topic - SME updates - CL #116 #117
#2175
How it works / Resilience - Autonomous network - topic - SME updates - CL#118
#2174
How it works / Security - Self encryption - topic - correct small typo
#2174
How it works / Security - Self encryption - topic - changed the alt text for the images
#2174
How it works / Security - Self encryption - topic - fixing reference location for images
#2174
How it works / Security - Self encryption - topic - moved images to sub folder to make links work
Corrected small typo -deleted s from resources
#2208

How to use it / A Farmer - topic - updating topic according to content
model. Removed Projects on SAFE topic, as no longer required.
#2208

Moving Libraries down to own section.
#2209

How to use it / An App Builder - topic - updating topic according to
content model
#2209

How to use it / An App Builder - topic - minor correction
#2210

How to use it / A Core Developer - topic - Adding new topic for core
developer from content model
#2207 / #2213

Short intro topic added for How it works. Moved the Libraries topic and
sub-topics under the Get involved chapter.